CN107924655B - Optical device and optical system - Google Patents
Optical device and optical system Download PDFInfo
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- CN107924655B CN107924655B CN201680046085.4A CN201680046085A CN107924655B CN 107924655 B CN107924655 B CN 107924655B CN 201680046085 A CN201680046085 A CN 201680046085A CN 107924655 B CN107924655 B CN 107924655B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/0977—Reflective elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
- G02B30/50—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images the image being built up from image elements distributed over a 3D volume, e.g. voxels
- G02B30/56—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images the image being built up from image elements distributed over a 3D volume, e.g. voxels by projecting aerial or floating images
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
- G02B30/60—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images involving reflecting prisms and mirrors only
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
- G02B6/006—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to produce indicia, symbols, texts or the like
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0063—Means for improving the coupling-out of light from the light guide for extracting light out both the major surfaces of the light guide
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F13/00—Illuminated signs; Luminous advertising
- G09F13/18—Edge-illuminated signs
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F19/00—Advertising or display means not otherwise provided for
- G09F19/12—Advertising or display means not otherwise provided for using special optical effects
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened surfaces
Abstract
The disclosed device is provided with: a light guide plate; a 1 st light emitting unit provided in a 1 st region of the light guide plate, having an optical surface on which light guided by the light guide plate is incident, the optical surface emitting the incident light from a 1 st light emitting surface and a 2 nd light emitting surface opposite to the 1 st light emitting surface; and a 2 nd light emitting portion provided in the 2 nd region of the light guide plate, having an optical surface on which light guided by the light guide plate is incident, the optical surface emitting the incident light from the 1 st emission surface and the 2 nd emission surface, wherein a radiation amount of light emitted from the 1 st emission surface by each of a plurality of optical surfaces of the 1 st light emitting portion is larger than a radiation amount of light emitted from the 2 nd emission surface by each of a plurality of optical surfaces of the 1 st light emitting portion, and a radiation amount of light emitted from the 2 nd emission surface by each of a plurality of optical surfaces of the 2 nd light emitting portion is larger than a radiation amount of light emitted from the 1 st emission surface by each of a plurality of optical surfaces of the 2 nd light emitting portion.
Description
Technical Field
The invention relates to an optical device and an optical system.
Background
There is known an optical dot type display in which two light guide plates formed with a plurality of reflection dots formed of minute recesses are arranged side by side and two display bodies are simultaneously or alternately displayed (for example, refer to patent document 1).
Patent document 1 Japanese laid-open patent application No. 2002-297070
Disclosure of Invention
Problems to be solved by the invention
When a light guide plate having light transmittance is used, light that is to be emitted from the emission surface of the light guide plate may leak from the back surface opposite to the emission surface by fresnel reflection at the emission surface. In addition, light may leak from the back surface of the light guide plate through a plurality of optical surfaces formed on the back surface or the like. Therefore, there is a problem that a person positioned on the opposite side of the emission surface of the light guide plate can recognize the pattern (pattern) formed by the leaked light.
Means for solving the problems
In the 1 st aspect, an optical device includes: a light guide plate for guiding light in a plane parallel to the 1 st emission plane;
a 1 st light emitting unit which is provided in a 1 st region of the light guide plate, has a plurality of optical surfaces, and on which light guided by the light guide plate enters the plurality of optical surfaces of the 1 st light emitting unit, the plurality of optical surfaces of the 1 st light emitting unit emit the entered light from a 2 nd light emitting surface opposite to the 1 st light emitting surface; and
a 2 nd light emitting portion provided in the 2 nd region of the light guide plate and having a plurality of optical surfaces, the light guided by the light guide plate being incident on the plurality of optical surfaces of the 2 nd light emitting portion, the plurality of optical surfaces of the 2 nd light emitting portion emitting the incident light from the 1 st light emitting surface and the 2 nd light emitting surface,
the amount of radiation of light emitted from the 1 st emission surface by each of the plurality of optical surfaces of the 1 st light emitting portion is larger than the amount of radiation of light emitted from the 2 nd emission surface by each of the plurality of optical surfaces of the 1 st light emitting portion, and the amount of radiation of light emitted from the 2 nd emission surface by each of the plurality of optical surfaces of the 2 nd light emitting portion is larger than the amount of radiation of light emitted from the 1 st emission surface by each of the plurality of optical surfaces of the 2 nd light emitting portion.
In a partial region adjacent to the 1 st region in the 2 nd region, an amount of radiation of light per unit area of the 2 nd light emitting portion emitted from the 2 nd emission surface may be substantially equal to an amount of radiation of light per unit area of the 1 st light emitting portion emitted from the 2 nd emission surface in a region adjacent to the 2 nd region in the 1 st region.
In the 2 nd region, the amount of light emitted from the 2 nd emission surface by the 2 nd light emitting portion is smaller as the distance from the 1 st region is larger.
The 2 nd light emitting portion has a plurality of optical surfaces formed with a pattern density smaller as the distance from the 1 st region increases.
The 2 nd light emitting portion has a plurality of optical surfaces having a smaller area as the distance from the 1 st region increases.
The 2 nd light emitting portion is provided on the light guide plate on the opposite side of the surface on which the 1 st light emitting portion is provided.
The 1 st light emitting portion may be provided on the 2 nd emission surface side of the light guide plate, and the 2 nd light emitting portion may be provided on the 1 st emission surface side.
The 1 st light emitting unit has a plurality of optical surfaces which can form an image visually recognizable from a position on the 1 st light emitting surface side outside the light guide plate by the light emitted from the 1 st light emitting surface.
The image formed by the light emitted from the 2 nd emission surface is blurred more than the image formed by the light emitted from the 1 st emission surface due to the light emitted from the plurality of optical surfaces included in the 2 nd light emitting portion.
The 2 nd light emitting portion may be provided in the 1 st region and the 2 nd region, the 2 nd light emitting portion may emit light of a color complementary to the color of the light emitted from the 2 nd light emitting surface by the 1 st light emitting portion from the 2 nd light emitting surface, and the amount of radiation of the light emitted from the 2 nd light emitting surface by the 1 st light emitting portion and the 2 nd light emitting portion may be substantially uniform over the 1 st region and the 2 nd region.
The 2 nd light emitting portion may be provided in the 1 st region and the 2 nd region, and emits white light from the 2 nd emission surface, and the amount of radiation of light emitted from the 2 nd emission surface by the 2 nd light emitting portion may be larger than the amount of radiation of light emitted from the 2 nd emission surface by the 1 st light emitting portion.
The 1 st light emitting unit may have a plurality of light converging units each having an optical surface on which light guided by the light guide plate enters, the plurality of light converging units having optical surfaces that cause outgoing light in a direction substantially converging to one converging point or converging line on the space or outgoing light in a direction substantially diverging from one converging point or converging line on the space to exit from the 1 st light emitting surface, the converging points or converging lines being different from each other among the plurality of light converging units, and an image may be formed spatially by converging the plurality of converging points or converging lines.
The plurality of light converging portions may be formed along a predetermined line in a plane parallel to the 1 st emission surface, respectively.
The 2 nd light emitting portion has a plurality of 2 nd light converging portions, each of the plurality of 2 nd light converging portions has an optical surface, and light guided by the light guide plate enters the optical surface of the plurality of 2 nd light converging portions, the plurality of 2 nd light converging portions have optical surfaces that cause light emitted in a direction substantially converging to one converging point or converging line on a space or light emitted in a direction substantially diverging from one converging point or converging line on a space to exit from the 2 nd light emitting surface, the converging points or converging lines of light emitted from the 2 nd light emitting portion are different from each other among the plurality of 2 nd light converging portions, and an image is formed in the space by the convergence of the plurality of converging points or converging lines of light emitted from the 2 nd light emitting portion.
The pattern density of the plurality of optical surfaces of the 1 st light emitting portion may be 30% or less.
The optical system according to claim 2 includes: the above optical device; and a 2 nd optical device disposed opposite to the 2 nd exit surface of the optical device,
the 2 nd optical device includes:
a 2 nd light guide plate which guides light in a plane parallel to the emission plane; and
a light emitting portion having a plurality of optical surfaces on which the light guided by the light guide plate is incident, the plurality of optical surfaces emitting the incident light from an emission surface of the 2 nd light guide plate,
the surface opposite to the emission surface of the 2 nd light guide plate is opposite to the 2 nd emission surface of the light guide plate,
the 1 st light emitting part has a plurality of optical surfaces which form an image visually recognizable from a position on the 1 st light emitting surface side outside the light guide plate by the light emitted from the 1 st light emitting surface,
the plurality of optical surfaces of the light emitting portion of the 2 nd light guide plate form an image that can be visually recognized from a position on the light emitting surface side outside the 2 nd light guide plate by the light emitted from the light emitting surface.
The above summary of the present invention does not describe all features of the present invention. Moreover, sub-combinations of these feature sets may also be inventions.
Drawings
Fig. 1 schematically shows a display device 10 and a stereoscopic image projected in space in one embodiment.
Fig. 2 schematically shows a yz cross section of the display device 10.
Fig. 3 shows the distribution of the amount of light emitted per unit area from each of the emission surface 71 and the back surface 72.
Fig. 4 schematically shows the leakage light of the rear surface 72 when the reflection surface 41 is not provided.
Fig. 5 schematically shows leakage light that leaks from the back surface 72 when the reflection surface 41 is provided.
Fig. 6 schematically shows a yz cross section of a display device 10A as a modification of the display device 10.
Fig. 7 schematically shows a display device 10a as a modification of the display device 10 and a stereoscopic image projected in space.
Fig. 8 schematically shows a yz cross section of a display device 10B as a modification of the display device 10.
Fig. 9 schematically shows leakage light leaking from the back surface 72 b.
Fig. 10 schematically shows a yz cross section of a display device 10C as a modification of the display device 10B.
Fig. 11 schematically shows leakage light leaking from the back surface 72 c.
Fig. 12 schematically shows a yz cross section of the display device 100.
Fig. 13 schematically shows an image formed by the display device 100.
Fig. 14 schematically shows an automatic ticket gate system 900 using the display device 100.
Detailed Description
The present invention will be described below with reference to embodiments of the invention, but the following embodiments do not limit the invention according to the scope of the claims. Note that all combinations of the features described in the embodiments are not necessarily essential to the means for solving the problems of the invention.
Fig. 1 schematically shows a display device 10 and a stereoscopic image projected in space in one embodiment. For easy understanding of the description, the drawings used in the description of the embodiments are schematic or schematic drawings. The drawings used in the description of the embodiments may not be drawn to actual scale.
The display device 10 has an emission surface 71 that emits light. The display device 10 forms an image 6 as a three-dimensional image by light emitted from the emission surface 71. The image 6 is a stereoscopic image that the user recognizes spatially. The stereoscopic image is an image recognized to be located at a position different from the emission surface 71 of the display device 10. The stereoscopic image also includes, for example, a two-dimensional image recognized at a position distant from the emission surface 71 of the display device 10. That is, the stereoscopic image is a concept including not only an image recognized as a stereoscopic shape but also an image recognized as a two-dimensional shape at a position different from the position on the display surface of the display device 10.
The display device 10 includes a light guide plate 70 and a light source 20. The light guide plate 70 is molded from a transparent resin material having a high refractive index. The material forming the light guide plate 70 may be, for example, polycarbonate resin (PC), polymethyl methacrylate resin (PMMA), glass, or the like. The light guide plate 70 is an example of an optical device. The display device 10 is an example of an optical system.
The light guide plate 70 has an emission surface 71 and a back surface 72 opposite to the emission surface 71. The emission surface 71 is one main surface of the light guide plate 70, and the back surface 72 is the other main surface. The light guide plate 70 has an end face 73, an end face 74, an end face 75, and an end face 76, which are end faces on the periphery of the light guide plate 70. The end surface 73 is a light entrance end surface of the light guide plate 70. The end surface 73 is provided with the light source 20, and light from the light source 20 enters the light guide plate 70 through the end surface 73. The end surface 74 is a surface opposite to the end surface 73. The end face 76 is a face opposite to the end face 75.
In the description of the embodiment, a rectangular coordinate system of a right-hand coordinate system of x-axis, y-axis, and z-axis may be used. The z-axis direction is defined as a direction perpendicular to the emission surface 71. The direction from the back surface 72 toward the emission surface 71 is defined as the positive z-axis direction. The y-axis direction is defined as a direction perpendicular to the end surface 73. The direction from the end surface 73 to the end surface 74 is defined as the positive y-axis direction. The x-axis is a direction perpendicular to the end surfaces 75 and 76, and a direction from the end surface 75 toward the end surface 76 is defined as a positive x-axis direction. In order to avoid redundant description, a plane parallel to the xy plane may be referred to as an xy plane, a plane parallel to the yz plane may be referred to as a yz plane, and a plane parallel to the xz plane may be referred to as an xz plane.
The light source 20 is, for example, an LED light source. The optical axis of the light source 20 is substantially parallel to the y-axis. Light from the light source 20 enters the end face 73, and the light entering the end face 73 from the light source 20 is totally reflected between the exit face 71 and the back face 72, and travels inside the light guide plate 70 while spreading in a plane parallel to the exit face 71 inside the light guide plate 70. The center of the light guided by the light guide plate 70 is substantially parallel to the y-axis. In this way, the light guide plate 70 guides the light from the light source 20 by spreading it in a plane parallel to the emission surface 71. The light beams guided within the light guide plate 70 to pass through the respective positions within the light guide plate 70 have spread angles smaller than a prescribed value at the respective positions within the light guide plate 70. Specifically, the light guided in the light guide plate 70 has a spread angle smaller than a predetermined value around the direction connecting each position in the light guide plate 70 and the light source 20. Specifically, the light flux passing through each position in the light guide plate 70 has a spread angle smaller than a predetermined value in the xy plane around the direction connecting each position in the light guide plate 70 and the light source 20. In the present specification, the spread of a light flux passing through a point inside and outside the light guide plate refers to the spread of light when the light flux is regarded as light emitted from the point. The spread of light beams passing through points inside and outside the light guide plate is sometimes simply referred to as light spread.
A plurality of light converging portions 30 including a light converging portion 30a, a light converging portion 30b, and a light converging portion 30c are formed on the back surface 72 of the light guide plate 70. The light converging portion 30 is formed substantially continuously in the X-axis direction. The light incident from the light source 20 to the end surface 73 is totally reflected between the emission surface 71 and the back surface 72, and the light guided by the light guide plate 70 is incident on each position in the x-axis direction of the light converging portion 30.
Here, the description is given assuming that the light guided by the light guide plate 70 does not spread in the direction along the yz plane. The light converging portion 30 substantially converges light incident on each position of the light converging portion 30 at a fixed point corresponding to each light converging portion 30. In fig. 1, as a part of the light converging portion 30, a light converging portion 30a, a light converging portion 30b, and a light converging portion 30c are particularly shown. In each of the light converging portion 30a, the light converging portion 30b, and the light converging portion 30c, a case is shown in which a plurality of light rays emitted from the light converging portion 30a, the light converging portion 30b, and the light converging portion 30c are converged.
Specifically, the light converging portion 30a corresponds to the fixed point PA on the image 6. The light beams from the respective positions of the light converging portion 30a converge at the fixed point PA. Therefore, the wave surface of the light from the light converging portion 30a becomes the wave surface of the light emitted from the fixed point PA. Similarly, the light converging portion 30b corresponds to the fixed point PB on the image 6, and the light beams from the respective positions of the light converging portion 30b converge at the fixed point PB. The light converging portion 30c corresponds to the fixed point PC on the image 6, and the light beams from the respective positions of the light converging portion 30c converge at the fixed point PC. Thus, the light beams from the respective positions of the arbitrary light converging portion 30 are converged substantially at the fixed point corresponding to the light converging portion 30. This allows the arbitrary light converging portion 30 to provide a wave surface of light emitted from the corresponding fixed point. The light converging portions 30 correspond to different fixed points, and an image 6 that can be spatially recognized is formed by the convergence of a plurality of fixed points corresponding to the light converging portions 30. In this way, the plurality of reflecting surfaces of the light converging portion 30 form an image that can be visually recognized from a position outside the light guide plate 70 on the side of the light exit surface 71 by the light emitted from the light exit surface 71. In this way, the display device 10 projects a stereoscopic image spatially.
In the present embodiment, each of the light converging portions 30 includes a plurality of reflecting surfaces formed substantially continuously in the x-axis direction. The directions of the reflecting surfaces of the light converging portions 30 are different from each other, and the light converging portions converge in directions in which the incident light is reflected toward a fixed point corresponding to the light converging portion 30. This causes the reflected light from the reflection surfaces of the light converging portions 30 to converge at a single fixed point corresponding to the light converging portion 30. For example, the light rays of the plurality of reflected lights reflected by the plurality of reflection surfaces of the light converging portion 30a converge on the fixed point PA. The light rays of the plurality of reflected lights reflected by the plurality of reflection surfaces of the light converging portion 30b converge on the fixed point PB. The light rays of the plurality of reflected lights reflected by the plurality of reflection surfaces of the light converging portion 30c converge on the fixed point PC.
As described above, the light guided by the light guide plate 70 has a spread angle smaller than a predetermined value in the xy plane centering on the direction connecting each position in the light guide plate 70 and the light source 20. That is, the light guided by the light guide plate 70 does not substantially spread in the xy plane around the direction connecting each position in the light guide plate 70 and the light source 20. In the case where the light converging portion 30 is provided at a position away from the light source 20, the light guided by the light guide plate 70 does not substantially spread in the xy plane toward the direction approximately centered on the y-axis direction at the position where the light converging portion 30 is provided. Therefore, for example, on a plane including the fixed point PA and parallel to the xz plane, the light from the light converging portion 30a converges substantially at a fixed point.
As shown in fig. 1, the light converging portion 30a is formed along a line 190 a. The light converging portion 30b is formed along a line 190 b. The light converging portion 30c is formed along a line 190 c. Here, lines 190a, 190b, and 190c are straight lines that are substantially parallel to the x-axis. The arbitrary light converging portion 30 is formed substantially continuously along a straight line substantially parallel to the x-axis.
In this way, the light converging portions 30 are formed along predetermined lines in a plane parallel to the emission surface 71. Further, the light guided by the light guide plate 70 is incident on each light converging portion of the light converging portion 30, and each light converging portion of the light converging portion 30 causes the outgoing light substantially converging in the direction of one converging point on the space to exit from the exit surface 71. When the fixed point is located on the rear surface 72 side of the light guide plate 70, the emitted light is light in a direction diverging from the fixed point. Therefore, when the fixed point is located on the rear surface 72 side of the light guide plate 70, the light condensing unit 30 has a reflection surface that causes the outgoing light in a direction substantially diverging from one spatial condensing point to exit from the exit surface 71.
In addition, in the case where the light guided by the light guide plate 70 does not spread in the direction along the yz plane, as described above, the light from the light converging portion 30 converges substantially at a fixed point. On the other hand, in the case where the light guided by the light guide plate 70 has a spread in the direction along the yz plane, the light reflected by the reflection surface of the light converging portion 30 is substantially converged on a converging line parallel to the yz plane and parallel to the emission surface. For example, the light of the light converging portion 30a includes PA, and is substantially converged on a line parallel to the yz plane and parallel to the emission plane. Similarly to the case where the fixed point is located on the rear surface 72 side of the light guide plate 70, the reflection surface of the light converging portion 30 causes the outgoing light in the direction substantially diverging from one converging line in the space to be emitted from the emission surface 71.
The light guide plate 70 is divided into a region 81 and a region 82 in the xy plane. The region 81 is a region where the light converging portion 30 is formed. The region 82 is a partial region around the region 81. Region 82 surrounds region 81. The region 82 is a region where a plurality of reflection surfaces 41 are formed. The light incident on the plurality of reflection surfaces of the light converging portion 30 is mainly emitted from the emission surface 71, but a part of the light is emitted as leakage light from the rear surface 72. On the other hand, light incident on the plurality of reflection surfaces 41 provided in the region 82 is mainly emitted from the rear surface 72. The brightness of the light emitted from the rear surface 72 by the reflection surface 41 of the region 82 is the same as the brightness of the light emitted from the rear surface 72 by the reflection surface 31 of the light converging portion 30. Therefore, the variation in the amount of light emitted from the rear surface 72 is reduced as compared with the case where the reflection surface 41 is not present. Therefore, the light leaking from the back surface 72 can be suppressed from appearing conspicuous to the eyes of the observer positioned on the back surface 72 side.
Fig. 2 schematically shows a yz cross section of the display device 10. The reflecting surface 31 is provided on the back surface 72. Most of the light incident on the reflecting surface 31 is reflected by the reflecting surface 31 and directed toward the emission surface 71. A part of the light incident on the reflection surface 31 passes through the reflection surface 31 and is emitted from the rear surface 72 to the outside as leakage light. Most of the light reflected by the reflecting surface 31 and directed toward the emission surface 71 is emitted to the outside through the emission surface 71. Part of the light reflected by the reflection surface 31 and directed toward the emission surface 71 is reflected by the emission surface 71 and directed toward the rear surface 72, and is emitted as leakage light from the rear surface 72. Thus, the reflecting surface 31 emits the incident light from the emission surface 71 and the back surface 72. Here, the amount of light emission 32 per unit area that the plurality of reflection surfaces 31 formed in the region 81 respectively emit from the emission surface 71 is larger than the amount of light emission 33 per unit area that the plurality of reflection surfaces 31 formed in the region 81 respectively emit from the back surface 72.
On the other hand, the reflection surface 41 is provided on the emission surface 71. Most of the light incident on the reflection surface 41 is reflected by the reflection surface 41 and directed to the back surface 72. A part of the light incident on the reflection surface 41 passes through the reflection surface 41 and is emitted from the emission surface 71 to the outside as leakage light. Most of the light reflected by the reflection surface 41 and directed to the rear surface 72 is emitted to the outside through the rear surface 72. Part of the light reflected by the reflection surface 41 and directed to the back surface 72 is reflected by the back surface 72 and directed to the emission surface 71, and is emitted from the emission surface 71. Thus, the reflection surface 41 emits the incident light from the emission surface 71 and the back surface 72. Here, the amount of light emission 43 per unit area emitted from the rear surface 72 by each of the plurality of reflection surfaces 41 formed in the region 82 is larger than the amount of light emission 42 per unit area emitted from the emission surface 71 by each of the plurality of reflection surfaces formed in the region 82.
The amount of light emission per unit area of the light emitted from the back surface 72 is substantially equal to the amount of light emission 43 from the region 82 and the amount of light emission 33 from the region 81 at least in a partial region adjacent to the boundary between the region 81 and the region 82. That is, the amount of light radiation per unit area of the reflection surface 41 emitted from the back surface 72 in at least a part of the region 82 adjacent to the region 81 is substantially equal to the amount of light radiation per unit area of the reflection surface 31 emitted from the back surface 72 in the region 81 adjacent to the region 82. This can prevent the boundary region between the region 81 and the region 82 from being visually conspicuous.
Fig. 3 shows the distribution of the amount of light emitted per unit area from each of the emission surface 71 and the back surface 72. Fig. 4 schematically shows the leakage light of the rear surface 72 when the reflection surface 41 is not provided. Fig. 5 schematically shows leakage light that leaks from the back surface 72 when the reflection surface 41 is provided.
As shown in distribution 34, light leaking from emission surface 71 also exists in region 82. However, since the light emission amount of the leakage light from the region 82 is smaller than the light emission amount of the leakage light from the region 81, the leakage light from the region 82 does not greatly affect the appearance of the image.
As shown in fig. 4, when the reflection surface 41 is not provided, an image corresponding to the image 6 appears conspicuous when viewed from the back surface 72. However, as shown in fig. 5, by providing the reflection surface 41, the image corresponding to the image 6 can be made inconspicuous. By providing the reflection surface 41 in this way, the blur (ぼけ) of the image formed by the light emitted from the rear surface 72 can be made larger than the blur of the image formed by the light emitted from the emission surface 71.
The amount of light emission I2 in the region 82 can be adjusted by at least one of the pattern density (pattern density) and the area of the reflection surface 41. For example, when the pattern density of the reflecting surface 41 is made substantially the same as the pattern density of the reflecting surface 31, the amount of light emitted from the exit surface 71 in the region 81 per unit area is I1, the area of the reflecting surface 31 is S1, and the area S2 of the reflecting surface 41 may be (I2/I1) × S1. The area of the reflecting surface 41 can be adjusted by at least one of the length of the reflecting surface 41 in the x-axis direction and the height of the reflecting surface 41 in the z-axis direction. On the other hand, when the area S2 of the reflection surface 41 is made to be the same as the area S1 of the reflection surface 31, the pattern density D2 of the reflection surface 41 may be (I2/I1) × D1 when the pattern density of the reflection surface 31 is D1. Thus, S2 × D2 can be made to coincide with (I2/I1) × S1 × D1. Further, S1 is preferably 30% or less.
Fig. 6 schematically shows a yz cross section and a light emission amount distribution of a display device 10A as a modification of the display device 10. The display device 10A has the same configuration as the display device 10 except that the light emission amount distribution from the region 82 is different.
As shown in the light emission amount distribution 44A, the light emission amount from the region 82 decreases with distance from the region 81. According to the display device 10A, not only the image corresponding to the image 6 can be made inconspicuous, but also the edge portion of the region 82 can be suppressed from being conspicuous. The light emission amount distribution from the region 82 may be a distribution expressed by a fermi distribution function or approximated with the light emission amount from the region 81 as a maximum value with respect to the coordinates (coordinates in the xy plane). This can suppress the light emission amount distribution from becoming discontinuous. In addition, the light emission distribution from the region 82 may be represented by any straight line exhibiting monotonicity, any curved line exhibiting monotonicity, or a combination of straight lines and curved lines exhibiting monotonicity. The light emission amount distribution from the region 81 and the light emission amount distribution from the region 82 may not be completely continuous, or may have a difference in light emission amount to the extent that the observer's eyes are inconspicuous.
As described above, the light emission amount I2 in the region 82 can be adjusted by at least one of the pattern density and the area of the reflection surface 41. In order to decrease the amount of light emitted from the back surface 72 as the distance from the region 81 increases like the distribution 44A, the plurality of reflection surfaces 41A may be formed with a pattern density that decreases as the distance from the region 81 increases. Further, the plurality of reflection surfaces 41A may have a smaller area as being farther from the region 81.
Fig. 7 schematically shows a display device 10a as a modification of the display device 10 and a stereoscopic image projected in space. The light guide plate 70 included in the display device 10a is different from the light guide plate 70 in that the light condensing portions of the emission surface 71 and the back surface 72 form images different from those of the light guide plate 70.
Fig. 7 (a) shows an image 6a and an image 8a formed by the light converging portion formed on the back surface 72, and a display device 10 a. The image 6a is a three-dimensional image and is formed by light emitted toward the emission surface 71 by the light converging portion formed on the back surface 72. The image 8a is a three-dimensional image formed by light leaking from the rear surface 72 through the light converging portion formed on the rear surface 72. The image 6a on the emission surface 71 side is brighter than the image 8a on the rear surface 72 side.
Fig. 7 (b) shows the display device 10a and the images 18a and 16a formed by the light converging portion formed on the emission surface 71. The light converging portion similar to the light converging portion 30 is formed on the emission surface 71 so as to emit the light forming the image 18a as a three-dimensional image toward the back surface 72 side. The image 18a is formed in a portion where the image 8a shown in fig. 7 (a) is not substantially formed. The area of the reflecting surface is defined for the light converging portion forming the image 18a so that the brightness of the image 18a is substantially the same as the brightness of the image 8 a. An image 16a as a three-dimensional image based on the leaked light is formed on the light exit surface 71 side by the light converging portion formed on the light exit surface 71, but the image 16a is darker than an image 18a formed on the light exit surface 71 side.
Fig. 7 (c) shows an image formed by the display device 10 a. As shown in the drawing, an image in which the image 8a and the image 18a are superimposed is formed on the back surface 72 side. Therefore, the image 8a shown in fig. 7 (a) can be made less visible to the observer. Since the image 16a shown in fig. 7 (b) is significantly darker than the image 6a shown in fig. 7 (a), the observer can visually recognize the image 6a sufficiently.
Fig. 8 schematically shows a yz cross section and a light emission amount distribution of a display device 10B as a modification of the display device 10. The display device 10B includes a display device 10a and a display device 10B. The display device 10a and the display device 10b each have a structure similar to that of the display device 10. The display device 10a has a light guide plate 70a and a light source 20 a. The display device 10b has a light guide plate 70b and a light source 20 b. The light guide plates 70a and 70b correspond to the light guide plate 70 of the display device 10. The light sources 20a and 20b correspond to the light sources 20 of the display device 10. The differences between the components included in the display devices 10a and 10b and the components included in the display device 10 will be described.
The light guide plate 70a and the light guide plate 70b are arranged in the order of the light guide plate 70b and the light guide plate 70a in the positive z-axis direction. The light guide plate 70a has an emission surface 71a and a back surface 72 a. The light guide plate 70b has an emission surface 71b and a back surface 72 b. The light guide plates 70a and 70b are disposed such that the back surface 72a of the light guide plate 70a faces the emission surface 71b of the light guide plate 70 b. When the light guide plate 70a is regarded as one light guide plate, the emission surface 71a corresponds to a light emission surface from which light for forming an image is emitted, and the back surface 72b corresponds to a surface opposite to the emission surface 71 a.
In the region 81, the light guide plate 70a has a reflection surface 31a corresponding to the reflection surface 31 on the back surface 72 a. The rear surface 72a has a plurality of reflection surfaces similar to the reflection surface 31 a. Here, these reflection surfaces are collectively referred to as reflection surfaces 31 a. The light guide plate 70a does not have a reflection surface corresponding to the reflection surface 41 on the emission surface 71 a. The light source 20a emits light in a specific wavelength region. For example, the light source 20a emits light in a partial wavelength region within the wavelength region of visible light. Specifically, the light source 20a emits light in the wavelength region of red. Therefore, the reflection surface 31a provided in the region 81 emits light in the wavelength region of red from the emission surface 71 a. Thus, in the region 81, a red image corresponding to the image 6 is formed on the emission surface 71a side by the light converging portion including the reflection surface 31a formed on the back surface 72 a. Distribution 34a shows the emission amount distribution of light from emission surface 71a in the y-axis direction.
In the display device 10B, similarly to the case where the leakage light from the reflection surface 31 toward the rear surface 72 side occurs in the display device 10, the leakage light of red color occurs from the rear surface 72B due to the reflection surface 31a provided in the region 81. The distribution 44a shows the light emission amount distribution from the back surface 72b in the y-axis direction. As shown in the distribution 44a, in the region 81, the amount of light emission I2 from the back surface 72b by the reflection surface 31a is substantially uniform.
In the region 81 and the region 82, the light guide plate 70b has a reflection surface 41b corresponding to the reflection surface 41 on the emission surface 71 b. The emission surface 71b has a plurality of reflection surfaces similar to the reflection surface 41 b. Here, these reflection surfaces are collectively referred to as reflection surfaces 41 b. The light guide plate 70b does not have a reflection surface corresponding to the reflection surface 31 on the back surface 72 b. The light source 20b emits light of a color complementary to the color of the light emitted from the light source 20a in the wavelength region of visible light. Specifically, the light source 20b emits light in a blue-green wavelength range. Therefore, the reflection surface 41b provided in the region 81 and the region 82 emits light in the blue-green wavelength region from the rear surface 72 b. The distribution 44b shows the emission amount distribution of light from the back surface 72b in the y-axis direction. As shown in the distribution 44b, the area 82 is larger than the area 81 with respect to the amount of light emission from the reflection surface 41b of the light guide plate 70 b.
The area of the reflection surface 41b provided in the region 82 is determined, for example, as: so that the amount of light emission from the reflecting surface 41b is I4 in the region 82. In consideration of the light emission amount I2 of the leakage light formed by the reflection surface 31a in the region 81, the area of the reflection surface 41b provided in the region 81 is determined to be smaller than the area of the reflection surface 41b provided in the region 82. The area of the reflection surface 41b provided in the region 81 is determined as follows: so that the light emission I3 from region 81 is I4-I2. When the density of the reflecting surfaces 41b is constant in the region 81 and the region 82, the area of the reflecting surface 41b provided in the region 81 may be I3/I4 times the area of the reflecting surface 41b provided in the region 82.
Here, the reflecting surface 41b is provided in the region 81 by adjusting at least one of the area and the density of the reflecting surface so that the combined light of the light emitted from the back surface 72b by the reflecting surface 31a provided in the region 81 and the light emitted from the back surface 72b by the reflecting surface 41b provided in the region 81 becomes substantially white light. In this case, the color of the light emitted from the rear surface 72b by the reflection surface 41b is cyan (for example, cyan) which is a complementary color to the color of the image 6.
Fig. 9 schematically shows light leakage from the back surface 72 b. When viewed from the rear surface 72b, the color of light leaking from the rear surface 72b is complementary to the color of the image 6 in the region 82 around the region 81, and is white in the region 81. As described above, the total light emission amount from the back surface 72b is substantially uniform over the regions 81 and 82. Therefore, the blurring amount indicated by the difference in brightness substantially disappears in the image of the light leaked from the reflection surface 31 a. On the other hand, there is a color difference between the region 81 and the region 82. However, since light from the region 81 that can be recognized as a pattern can be substantially decolored (colored), it is possible to make it difficult for leakage light to be visually recognized as a pattern. The color of light from the region 81 and the color of light from the region 82 are not in a complementary relationship. Therefore, even in the display device 10B, the pattern formed by the light leaked from the region 81 by the reflection surface 31a can be made inconspicuous from the rear surface 72B side.
In addition, the light guide plate 70a of the display device 10a and the light guide plate 70b of the display device 10b may be regarded as one light guide plate. The same function as that of the display device 10B can be achieved by using a single light guide plate having one emission surface 71 and one back surface 72 like the light guide plate 70. For example, the same function as that of the display device 10B can be achieved by a single light guide plate by using a white light source as the light source 20, providing a reflective film that reflects light in a wavelength region of a specific color such as red on the reflective surface 31 formed on the rear surface 72, and providing a reflective film that reflects light in a wavelength region other than the wavelength region of the specific color on the reflective surface 41 formed on the emission surface 71. As the reflective film, dichroic coating (dichroic coating) or the like can be applied.
Fig. 10 schematically shows a yz cross section and a light emission amount distribution of a display device 10C as a modification of the display device 10B. The display device 10B includes a display device 10a and a display device 10 c. The configuration of the display device 10a is as described above, and therefore, the description thereof is omitted. The display device 10c has a similar structure to the display device 10 b. The display device 10c has a light guide plate 70c and a light source 20 c. The light guide plate 70c corresponds to the light guide plate 70b of the display device 10 b. The light source 20c corresponds to the light source 20b of the display device 10 b. The differences between the components included in the display device 10c and the components included in the display device 10b will be described.
The light guide plate 70a and the light guide plate 70c are arranged in the order of the light guide plate 70c and the light guide plate 70a in the positive z-axis direction. The light guide plates 70a and 70c are disposed such that the back surface 72a of the light guide plate 70a faces the emission surface 71c of the light guide plate 70 c.
In the region 81 and the region 82, the light guide plate 70c has a reflection surface 41c corresponding to the reflection surface 41 on the emission surface 71 c. The emission surface 71c has a plurality of reflection surfaces similar to the reflection surface 41 c. Here, these reflection surfaces are collectively referred to as reflection surfaces 41 c. The light guide plate 70c does not have a reflection surface corresponding to the reflection surface 31 on the back surface 72 c. The light source 20c includes a wavelength region of light emitted from the light source 20a in a wavelength region of visible light, and emits light in a wavelength region larger than the wavelength region. Specifically, the light source 20c emits substantially white light. Therefore, the reflection surface 41c provided in the region 81 and the region 82 emits substantially white light from the back surface 72 c. The distribution 44c shows the emission amount distribution of light from the back surface 72c in the y-axis direction. As shown in the distribution 44c, the light emission amount of the white light emitted from the rear surface 72c by the reflection surface 41c of the light guide plate 70c is substantially uniform over the regions 81 and 82. The area and the pattern density of the reflecting face 41bc are uniformly set over the range of the region 81 and the region 82 so that the light emission amount is uniform over the range of the region 81 and the region 82.
The amount of light emission I5 emitted from the back surface 72c by the reflection surface 41c is greater than the amount of light emission I2 emitted from the back surface 72c by the reflection surface 31 a. For example, I5 may be more than twice as large as I2. Distribution 46 shows the distribution of the total amount of radiation of the light emitted from the rear surface 72c by the reflection surface 31a of the light guide plate 70a and the reflection surface 41c of the light guide plate 70c in the y-axis direction. As shown in distribution 46, the light emission in region 81 is I5+ I2.
Fig. 11 schematically shows light leakage from the back surface 72 c. As described above, the light emission amount I5 of the reflection surface 41c from the back surface 72c is larger than the light emission amount I2 of the reflection surface 31a from the back surface 72 c. Therefore, when viewed from the rear surface 72c, the leakage light leaking from the rear surface 72c appears reddish in the region 81, and becomes bright achromatic light in the region 82 around the region 81. Therefore, it is possible to make it difficult to visually recognize the image of the light leaked from the rear surface 72c by the reflection surface 31 a.
Specifically, the ratio of the light emission amount in the region 82 to the light emission amount in the region 81 is (I5+ I2)/I5. The larger I5, the smaller the ratio of brightness at the boundary of regions 81 and 82. That is, the larger I5 is, the more difficult it is to visually recognize an image formed by the leakage light. According to the display device 10C, when I5 is larger than I2, the blur of the image of the light leakage on the reflection surface 31a can be increased. As described above, according to the display device 10C, the pattern formed by the leakage light from the region 81 on the reflection surface 31a can be made inconspicuous from the rear surface 72C side.
In addition, the light guide plate 70a of the display device 10a and the light guide plate 70c of the display device 10c may be regarded as one light guide plate. The same function as that of the display device 10C can be achieved by using a single light guide plate having one emission surface 71 and one back surface 72 like the light guide plate 70. For example, a white light source is used as the light source 20, and a reflective film that reflects light in a wavelength region of a specific color such as red is provided on the reflective surface 31 formed on the rear surface 72, whereby the same function as that of the display device 10C can be achieved even with a single light guide plate. As the reflective film, a dichroic coating or the like can be applied.
Fig. 12 schematically shows a yz cross section of the display device 100. Fig. 13 (a) and 13 (b) schematically show images formed by the display device 100.
The display device 100 includes a display device 10B and a display device 10C. The display device 10B is a modification of the display device 10, and has the same configuration as the display device 10 except that it has a reflection surface 31B for forming an image different from the image 6. The display device 10C is a modification of the display device 10, and has the same configuration as the display device 10 except that it has a reflection surface 31C for forming an image different from the image 6.
The back surface 72 of the display device 10B is disposed opposite the back surface 72 of the display device 10C. The emission surface 71 of the display device 10B provides one main surface of the display device 100. The emission surface 71 of the display device 10C provides the other main surface of the display device 100.
Fig. 13 (a) shows an image 6B formed by the display device 10B on the emission surface 71 side of the display device 10B. Fig. 13 (b) shows an image 6C formed by the display device 10C on the emission surface 71 side of the display device 10C. In this way, the display device 100 provides different images on the emission surface 71 side of the display device 10B and the emission surface 71 side of the display device 10C.
According to the display device 100, spatial variation in the amount of light radiation of the leakage light leaking from the rear surface 72 of the display device 10C can be reduced. Therefore, it is possible to suppress the image 6B from being difficult to see due to the leakage light leaking from the display device 10C. Similarly, since a spatial variation in the amount of light radiation of the leakage light leaking from the rear surface 72 of the display device 10B can be reduced, it is possible to suppress the image 6C from being difficult to see due to the leakage light leaking from the display device 10B.
Fig. 14 schematically shows an automatic ticket gate system 900 using the display device 100. The automatic ticket gate system 900 includes a display device 100a, a display device 100b, a display device 910, and a plurality of automatic ticket gates 920.
The display device 100a and the display device 100b have the same structure as the display device 100. The display device 100a and the display device 100b are disposed so that the directions of the main surfaces are different. Specifically, it is set up to: the direction of the emission surface 71 of the display device 10B provided in the display device 100a and the direction of the emission surface 71 of the display device 10C provided in the display device 100B substantially coincide.
The display device 100a and the display device 100b are disposed above the automatic ticket barrier 920. An image 6B is a mark (mark) showing a direction in which the passage is permitted, and an image 6C is a mark showing the passage prohibition. According to the automatic ticket gate system 900, a user who wants to enter the station through the automatic ticket gate 920 and a user who wants to exit the station through the automatic ticket gate 920 can be notified of the positions of the automatic ticket gates through which the respective users can pass in a three-dimensional image.
The display device 910 forms an image 906a notifying the user who passes through the automatic ticket gate 920 of the position of the platform and an image 906b notifying the user located in the station of the position of the exit. The image 906a may be an image that can be recognized at a position further inside than the position where the display device 910 is disposed when viewed with the eyes of the user. The image 906b may be an image that can be recognized at a position closer to the front than the position where the display device 910 is disposed when viewed with the eyes of the user located in the station. The display device 910 has the same configuration as the display device 100 except that the shape of the formed image and the display device is different from that of the display device 100, and therefore, the detailed description of the configuration is omitted.
Further, as a modification of the display device 100, a display device in which two display devices identical to the display device 10B and the display device 10C are further overlapped may be provided. For example, a display device having the same configuration as the display device 10C may be provided between the display device 10B and the display device 10C such that the emission surface faces the rear surface 72B of the display device 10B, and a display device having the same configuration as the display device 10B may be provided such that the rear surface faces the emission surface 71B of the display device 10C. Further, the light source to be made to emit light is selected in accordance with the image to be presented to the user, and control can be performed to switch between the image presented to the user who wants to enter the station through the automatic ticket gate 920 and the image presented to the user who wants to exit the station through the automatic ticket gate 920.
In the above-described embodiment, the function of the light guide plate 70 having the reflecting surface 31 and the reflecting surface 41 is described. However, as an optical surface having the same function as the reflection surface 31 of the light converging portion 30, a reflection type fresnel lens may be used. As an optical surface having the same function as the reflection surface 31, an optical surface that emits light from the emission surface 71 by refraction or diffraction can be applied. Similarly, as an optical surface having the same function as the reflection surface 41, a reflection type fresnel lens or an optical surface that emits light from the emission surface 71 by refraction or diffraction can be applied.
The optical surface corresponding to the reflection surface 31 and the optical surface corresponding to the reflection surface 41 may be provided on either one of the emission surface 71 and the back surface 72. For example, when the reflection surface 31 is provided on the rear surface 72, an optical surface corresponding to the reflection surface 41 may be provided on the rear surface 72. In this case, the optical surface corresponding to the reflection surface 41 may be a refraction surface that refracts incident light to cause light to be emitted mainly toward the back surface 72 side. The optical surface corresponding to the reflection surface 41 may be a transmission type diffraction element that diffracts incident light to emit light mainly toward the rear surface 72 side. The optical surface corresponding to the reflection surface 41 may be a reflection surface that reflects incident light and causes the light to be emitted mainly toward the rear surface 72.
Further, an optical surface corresponding to the reflection surface 31 may be provided on the emission surface 71. In this case, the optical surface corresponding to the reflection surface 31 may be a refraction surface that refracts incident light to cause light to be emitted mainly toward the emission surface 71. The optical surface corresponding to the reflection surface 31 may be a transmission type diffraction element that diffracts incident light to emit light mainly toward the emission surface 71. The optical surface corresponding to the reflection surface 31 may be a reflection surface that reflects incident light and causes the light to be emitted mainly toward the emission surface 71. As described above, the reflection surface 31 and the reflection surface 41 may be provided on the same main surface side of the display device 10.
The light source 20 may be a laser light source. The light source 20 may be, for example, a laser diode. When a diffraction element is used, coherent light substantially belonging to a single wavelength region is preferable.
The present invention has been described above with reference to the embodiments, but the technical scope of the present invention is not limited to the scope described in the above embodiments. It will be apparent to those skilled in the art that various modifications and improvements may be added to the above embodiments. As is apparent from the description of the scope of the claims, modifications and improvements added thereto may be included in the technical scope of the present invention.
Note that the execution order of each process such as the operation, procedure, step, and stage in the apparatus, system, program, and method shown in the claims, the specification, and the drawings can be realized in any order unless otherwise specified as "before", or "first", and also as long as the output of the preceding process is not used in the subsequent process. For convenience, the operational flow in the claims, the specification, and the drawings does not mean that the operations are necessarily performed in this order even if the description is made using "first", "next", and the like.
Description of the reference symbols
6. 8, 16, 18: image
10: display device
20: light source
30: light converging part
31. 41: reflecting surface
70: light guide plate
71: light exit surface
72: back side of the panel
73: end face
74: end face
75: end face
76: end face
100: display device
190: thread
Claims (15)
1. An optical device, wherein the optical device is provided with:
a light guide plate for guiding light in a plane parallel to the 1 st emission plane;
a 1 st light emitting unit that is provided in a 1 st region of the light guide plate and has a plurality of optical surfaces, the light guided by the light guide plate being incident on the plurality of optical surfaces of the 1 st light emitting unit, the plurality of optical surfaces of the 1 st light emitting unit emitting the incident light from a 2 nd light emitting surface opposite to the 1 st light emitting surface; and
a 2 nd light emitting portion which is provided in a 2 nd region of the light guide plate and has a plurality of optical surfaces, the light guided by the light guide plate being incident on the plurality of optical surfaces of the 2 nd light emitting portion, the plurality of optical surfaces of the 2 nd light emitting portion emitting the incident light from the 1 st light emitting surface and the 2 nd light emitting surface,
the amount of radiation of light emitted from the 1 st emission surface by each of the plurality of optical surfaces of the 1 st light emitting portion is larger than the amount of radiation of light emitted from the 2 nd emission surface by each of the plurality of optical surfaces of the 1 st light emitting portion, the amount of radiation of light emitted from the 2 nd emission surface by each of the plurality of optical surfaces of the 2 nd light emitting portion is larger than the amount of radiation of light emitted from the 1 st emission surface by each of the plurality of optical surfaces of the 2 nd light emitting portion,
the 2 nd region is a partial region around the 1 st region, the 2 nd region surrounds the 1 st region, and an amount of radiation of light per unit area emitted from the 2 nd emission surface by the 2 nd light emission part in a partial region adjacent to the 1 st region in the 2 nd region is equal to an amount of radiation of light per unit area emitted from the 2 nd emission surface by the 1 st light emission part in a region adjacent to the 2 nd region in the 1 st region.
2. The light device of claim 1,
in the 2 nd region, the amount of light emitted from the 2 nd emission surface by the 2 nd light emitting portion is smaller as the distance from the 1 st region is larger.
3. The light device according to claim 1 or 2,
the 2 nd light emitting portion has the plurality of optical surfaces formed with a pattern density smaller as the distance from the 1 st region becomes larger.
4. The light device according to claim 1 or 2,
the 2 nd light emitting portion has the plurality of optical surfaces having smaller areas as the optical surfaces are farther from the 1 st region.
5. The light device according to claim 1 or 2,
the 2 nd light emitting portion is provided on the light guide plate on a side opposite to a side on which the 1 st light emitting portion is provided.
6. The light device according to claim 1 or 2,
the 1 st light emitting part is disposed on the 2 nd light emitting surface side of the light guide plate,
the 2 nd light emitting portion is provided on the 1 st light emitting surface side.
7. The light device according to claim 1 or 2,
the 1 st light emitting unit forms an image visually recognizable from a position on the 1 st light emitting surface side outside the light guide plate by the light emitted from the 1 st light emitting surface.
8. The light device of claim 7,
the image formed by the light emitted from the 2 nd emission surface is blurred more than the image formed by the light emitted from the 1 st emission surface due to the light emitted from the 2 nd emission surface by the 2 nd light emitting portion.
9. The light device according to claim 1 or 2,
the 2 nd light emitting portion is provided in the 1 st region and the 2 nd region, and the 2 nd light emitting portion emits light of a color complementary to the color of the light emitted from the 2 nd light emitting surface by the 1 st light emitting portion from the 2 nd light emitting surface,
the amount of light emitted from the 2 nd emission surface by the 1 st light emitting portion and the 2 nd light emitting portion is uniform over the 1 st region and the 2 nd region.
10. The light device according to claim 1 or 2,
the 2 nd light emitting portion is provided in the 1 st region and the 2 nd region, and emits white light from the 2 nd emission surface,
the amount of radiation of the light emitted from the 2 nd emission surface by the 2 nd light emitting portion is larger than the amount of radiation of the light emitted from the 2 nd emission surface by the 1 st light emitting portion.
11. The light device according to claim 1 or 2,
the 1 st light emitting unit has a plurality of 1 st light converging units, each of the plurality of 1 st light converging units having an optical surface, the light guided by the light guide plate being incident on the optical surface of the plurality of 1 st light converging units, the optical surface of the plurality of 1 st light converging units emitting light in a direction of converging substantially at one converging point or converging line on a space or light in a direction of diverging substantially from one converging point or converging line on a space from the 1 st emitting surface,
the converging points or converging lines are different from each other among the plurality of 1 st light converging portions, and an image is formed spatially by the convergence of the plurality of converging points or converging lines.
12. The light device of claim 11,
the plurality of 1 st light converging portions are formed along a predetermined line in a plane parallel to the 1 st emission surface.
13. The light device according to claim 1 or 2,
the 2 nd light emitting portion has a plurality of 2 nd light converging portions each having an optical surface, the light guided by the light guide plate enters the optical surfaces of the plurality of 2 nd light converging portions, the optical surfaces of the plurality of 2 nd light converging portions cause the outgoing light in a direction substantially converging to one converging point or converging line on the space or the outgoing light in a direction substantially diverging from one converging point or converging line on the space to exit from the 2 nd outgoing surface,
the convergence point or the convergence line of the light emitted from the 2 nd light emitting portion is different between the plurality of 2 nd light converging portions, and an image is formed spatially by the convergence of the plurality of convergence points or the convergence lines of the light emitted from the 2 nd light emitting portion.
14. The light device according to claim 1 or 2,
the pattern density of the plurality of optical surfaces of the 1 st light emitting unit is 30% or less.
15. A light system, wherein the light system is provided with:
the light device of any one of claims 1 to 13; and
a 2 nd optical device disposed opposite to the 2 nd exit face of the optical device,
the 2 nd optical device includes:
a 2 nd light guide plate which guides light in a plane parallel to the emission plane; and
a light emitting unit having a plurality of optical surfaces on which the light guided by the light guide plate is incident, the plurality of optical surfaces emitting the incident light from the light emitting surface of the 2 nd light guide plate,
a surface of the 2 nd light guide plate opposite to the emission surface faces the 2 nd emission surface of the light guide plate,
the plurality of optical surfaces of the 1 st light emitting part form images that can be visually recognized from the 1 st light emitting surface side position outside the light guide plate by the light emitted from the 1 st light emitting surface,
the plurality of optical surfaces of the light emitting portion of the 2 nd light guide plate form an image that can be visually recognized from a position on the light emitting surface side outside the 2 nd light guide plate, by the light emitted from the light emitting surface.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015-199578 | 2015-10-07 | ||
| JP2015199578A JP6544186B2 (en) | 2015-10-07 | 2015-10-07 | Optical device and optical system |
| PCT/JP2016/074892 WO2017061185A1 (en) | 2015-10-07 | 2016-08-25 | Optical device and optical system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107924655A CN107924655A (en) | 2018-04-17 |
| CN107924655B true CN107924655B (en) | 2020-01-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201680046085.4A Active CN107924655B (en) | 2015-10-07 | 2016-08-25 | Optical device and optical system |
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| Country | Link |
|---|---|
| US (1) | US10598845B2 (en) |
| JP (1) | JP6544186B2 (en) |
| CN (1) | CN107924655B (en) |
| DE (1) | DE112016004601B4 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP6743419B2 (en) * | 2015-11-10 | 2020-08-19 | オムロン株式会社 | Display system and gate device |
| JP6620697B2 (en) * | 2016-08-04 | 2019-12-18 | オムロン株式会社 | Optical device |
| FR3079625B1 (en) * | 2018-03-30 | 2020-03-06 | Valeo Vision | IMAGE DISPLAY DEVICE FOR A MOTOR VEHICLE |
| JP7392418B2 (en) * | 2019-11-25 | 2023-12-06 | オムロン株式会社 | display device |
Family Cites Families (12)
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| GB9617314D0 (en) | 1996-08-17 | 1996-09-25 | Fryco Ltd | Optical images |
| JP3503608B2 (en) | 2001-03-30 | 2004-03-08 | 岡谷電機産業株式会社 | Light point type display |
| JP2002297072A (en) * | 2001-03-30 | 2002-10-09 | Okaya Electric Ind Co Ltd | Light spot type display device |
| EP2051003A4 (en) | 2006-06-16 | 2013-07-31 | Fujifilm Corp | Light guide plate, light guide plate assembly, and surface illuminating device and liquid crystal display device using these |
| JP4813982B2 (en) * | 2006-06-16 | 2011-11-09 | 富士フイルム株式会社 | Light guide plate assembly and planar illumination device using the same |
| CN101471006A (en) | 2007-12-26 | 2009-07-01 | 富士迈半导体精密工业（上海）有限公司 | Luminous panel |
| EP2578920A4 (en) * | 2010-05-26 | 2014-10-29 | Skg Co Ltd | Illumination device |
| CN103155176A (en) * | 2010-06-07 | 2013-06-12 | 森普留斯公司 | Photovoltaic devices with off-axis image display |
| US8764266B2 (en) | 2012-03-30 | 2014-07-01 | GE Lighting Solutions, LLC | Edge-lit flat panel repetitive lighting fixture |
| US20140268327A1 (en) | 2013-03-15 | 2014-09-18 | Opsec Security Group, Inc. | Optically variable device exhibiting non-diffractive three-dimensional optical effect |
| JP5701434B1 (en) * | 2014-07-11 | 2015-04-15 | 株式会社フジクラ | Display device and display method |
| CN204577029U (en) * | 2015-02-05 | 2015-08-19 | 广州震雄装饰工程有限公司 | A kind of advertising lamp box being provided with bright enhancement film |
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2015
- 2015-10-07 JP JP2015199578A patent/JP6544186B2/en active Active
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2016
- 2016-08-25 WO PCT/JP2016/074892 patent/WO2017061185A1/en active Application Filing
- 2016-08-25 DE DE112016004601.4T patent/DE112016004601B4/en active Active
- 2016-08-25 CN CN201680046085.4A patent/CN107924655B/en active Active
- 2016-10-04 TW TW105131964A patent/TW201724063A/en unknown
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| TW201724063A (en) | 2017-07-01 |
| DE112016004601T5 (en) | 2018-06-21 |
| US20180180792A1 (en) | 2018-06-28 |
| JP2017072727A (en) | 2017-04-13 |
| US10598845B2 (en) | 2020-03-24 |
| JP6544186B2 (en) | 2019-07-17 |
| WO2017061185A1 (en) | 2017-04-13 |
| DE112016004601B4 (en) | 2022-10-13 |
| CN107924655A (en) | 2018-04-17 |
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